[collectd] GenericJMX replace whitespace

[Poil]

Hi,

I'm trying to replace whitespace in PluginInstance on Plugin GenericJMX 
Example : "GenericJMX-memory_pool-Code Cache" must be "GenericJMX-memory_pool-Code_Cache"

So I've tried this but this is doing nothing.

########################################"
LoadPlugin java
LoadPlugin "target_replace"
<Plugin "java">
  # required JVM argument is the classpath
  # JVMArg "-Djava.class.path=/installpath/collectd/share/collectd/java"
  # Since version 4.8.4 (commit c983405) the API and GenericJMX plugin are
  # provided as .jar files.
  JVMARG "-Djava.class.path=/usr/share/collectd/java/collectd-api.jar:/usr/share/collectd/java/generic-jmx.jar"
  LoadPlugin "org.collectd.java.GenericJMX"
  
  <Plugin "GenericJMX">
    # Memory usage by memory pool.
    <MBean "memory_pool">
      ObjectName "java.lang:type=MemoryPool,*"
      InstancePrefix "memory_pool-"
      InstanceFrom "name"
      <Value>
        Type "memory"
        #InstancePrefix ""
        #InstanceFrom ""
        Table true
        Attribute "Usage"
      </Value>
    </MBean>

    <Connection>
      Host "doc01t"
      ServiceURL "service:jmx:rmi:///jndi/rmi://localhost:8086/jmxrmi"
      Collect "memory_pool"
    </Connection>
  </Plugin>
</Plugin>

<Chain "PreCache">
<Rule "strip_space">
   <Match "regex">
     Plugin "GenericJMX"
   </Match>
   <Target "replace">
     PluginInstance " " "_"
   </Target>
</Rule>
</Chain>
########################################"

In logfile I've got only this which is speaking about replace
[2012-07-06 11:07:48] type = java
[2012-07-06 11:07:48] type = target_replace
[2012-07-06 11:07:48] fc_register_target (replace);
[2012-07-06 11:07:48] type = target_replace
[2012-07-06 11:07:48] fc_register_target (replace);


Note : I'm using network plugin and there is no rules on the target server

Any help ? :)

Best regards,